Which factor is NOT typically considered in measuring HVAC performance?

Measuring HVAC performance typically involves evaluating factors that directly impact the operational efficiency and effectiveness of the system. Energy efficiency ratings provide a quantifiable measure of how well the HVAC system converts energy into desired heating or cooling output, which is critical for understanding its performance relative to energy consumption. Airflow measurements are crucial as they determine the volume of air being distributed throughout the space, directly affecting comfort levels and system efficiency. Humidity control is another essential consideration, as an HVAC system must maintain proper humidity levels for indoor comfort and to prevent issues such as mold growth.

While system age can influence performance - older systems may not operate as efficiently as newer ones - it is not a direct measurement of performance itself. Instead, system age is more of a contextual factor influencing potential efficiency or reliability but does not provide a tangible metric for evaluating how well the system is currently performing in comparison to specific performance standards or operational metrics.